I will be asleep by the time you get home, so please don’t make too much noise.
I will asleep by the time you get home, so please don’t make too much noise.*
What is the different between will and will be?
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asleep is an adjective, therefore you have to use the corresponding conjugated to be infront of it.
The same applies for these sentences:
I am afraid.
I was hungry. (note that "was" also is "to be" just in a past tense)
I have been thirsty. ("have" is not "to be" therefore "been" had to be inserted)
"I will be asleep" vs "I will asleep"
The first sentence is grammatically correct, but the second is not.
"Asleep" is an adjective, which means sleeping/not awake. It needs an auxiliary verb before it in this sentence. The auxiliary verb "be" is there in the sentence, so it's correct.
"Asleep" is not a verb, so it's wrong to use it as a verb in the second sentence.